Siemens 5SY4440-7



The Siemens 5SY4440-7 is a reliable miniature circuit breaker designed for versatile industrial applications. This 40-amp, 4-pole breaker operates at 400 VAC with a frequency range of 50/60 Hz, providing effective circuit protection with a breaking capacity of 10 kA. Featuring a C curve trip characteristic, it responds well to moderate inrush currents typical in motor and lighting circuits. The breaker is equipped with a toggle switch actuator and uses screw-type terminals for secure wiring connections. Its compact design allows for easy DIN rail mounting, and it is rated for operation in environments from -25 to +55 degrees Celsius with an IP20 protection level. This product is supplied through BSP Automation, ensuring easy access for industrial automation projects.
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